Electric hoist



June 3 w43. c. s. SCHROEDER ELECTRIC HOIST HIM. n Hvll INVENTOR BY//q//fR ATTORNEY 5m@ 3 WM. c. s. SCHROEDER ELECTRIC HOIST Filed OCT..20, 1938 3 Sheets-Sheet 2 zal# ' INVENTOR Ca/Lof/QWQ ATTORNEY .Fume 3,1941. c. s. scHRoEDER ELECTRIC HOIST Filed Oc. 20, 1938 3 Sheets-Sheet.5

lNvENToR Wgfacoh ATTORNEY Patented June 3, 1941 1 ELECTRIC nors'rCharles S. Schroeder, Philadelphia, Pa., assignor D to The `Yale & TowneManufacturing Company, Stamford, Conn., a corporation oi' ConnecticutApplication October 20, 1938, Serial No. 236,037

s claims. (ci. 25a-16s) This invention relatesv to an electric hoist ofthe type in which a rotating drum winds and unwinds a steel cable.

The basic elements of my hoist are old, as is also the basicarrangement. The novelty in my construction resides mainly in theparticular arrangement of the power means relatively to the rotatingdrum whereby all of the gearing is mounted in a single chamber, and isadapted to be driven in lthat chamber by a driving shaft connected to anelectric motor.

A further feature of novelty in my invention is the arrangement of thebraking means so that they may be readily accessible and may be cooledduring the operation of the hoist. The means whereby the braking meansare cooled forms also an important feature of my contribution.

For a description of my invention, I shall refer to the drawings whereinFig. 1 is a partial longitudinal section of my hoist. Fig. 2 isavertical section through my hoist along lines 2 2 of Fig. 1. Figs 3, 4,5 and 6 are sections taken along lines 3 3, 3 3, 5 5 and 6 6respectively of Fig. 1. The various sections of Figs. 3,4, 5 and 6represented in Fig. l are shown by lines I i in the said figures.

Referring now more particularly to the drawings, my hoist utilizes acentral supporting member i having two pairs of eyes il traversed bybolts i2 whereby the hoist may be supported from plates i3 of a trolleyassembly i3 (Fig. 2). The central supporting member i3 has securedthereto at one end by suitable means, a casing l terminating in what Iprefer to call a partition I 6. At its other end, the centralsupportingI member iii has secured thereto a casing il terminating inwhat I prefer to call a partition member i8.

Supported within the casing Il is a motor of conventional type. Thismotor has a main shaft i9 supported in a suitable bearing 20 carriedbythe partition i8, the drive shaft being coupled at 20 to a further driveshaft 2l, the shafts I9 and 2l being termed by me a drive shaftassembly. It is obvious that different shaft connections may be used ifdesired. The shaft 2i traverses a drum supporting sleeve 22 which ismounted in a bearing 23 on the partition i6 at one end thereof, and abearing 2t on the partition I3 at the other end thereof. The windingdrum 25 of my hoist is keyed at 28 to the sleeve 22 for rotationtogether therewith. Secured to the casing Ai5 is a further casingportion 2l to which in turn is secured the end cover 28a of the hoist.

Through the cooperation of casings i5 and 21, there is formed a gearchamber, designated generally by the reference numeral 28. Within thisgear chamber there is adapted to rotate the gear wheel 23 keyed to oneend of the sleeve 22 lon which the drum 25 is mounted. This gear Z9 isdriven by a pinion 33, also within the gear chamber, which pinion is inturn driven by a series of gears through the intermediary of a Westontype of brake and drive mechanism, designated generally by the referenceletter W in Fig. 1, and comprising the usual ratchet 3i,

pawl 32, friction disk 33, and internally threaded gear wheel 33.

The internally threaded gear wheel 34 is mounted about the threadedshaft 35, and is adapted to be driven by the pinion 36 formed on thedrive shaft 3i. Those skilled in the art will appreciate that when thedrive shaft 2l is rotated in one direction, the internally threaded gear34 mst moves on its screw threads 35 to bind itself to the friction disk33, and then through the friction disk 33 drives the gear mechanism, tothe end that the sleeve 22 shall be rotated in a direction to wind thecable about the drum 25.

Rotation of the ratchet 3i in a reverse direction is prevented by thepawl 32, so that when it is desired to lower the load, it is necessaryto create a slipping action between the friction disk 33 and the ratchet3i, which is made possible through the screw threaded relation betweenthe internally threaded gear 34 and the shaft 3.5. When the load seeksto run ahead of the gear 3d, there will be a binding of the gear 36 todisk 33 and the pawl 32 will prevent further movement, thus preventingthe lowering action of the drum. This action is well known in the artand need not be described in more detail here.

To further control the load, the end of the drive shaft 2l has securedthereto a brake drum 3l with which cooperates a pair of brake shoes 3B,best shown in Fig. 5. These brake shoes are normally pressed in abraking direction by springs 33, and are adapted to be moved out ofbraking relation to the drum 3l against the springs 39 upon rotation ofa cam 40 fitting between a pair of abutments 4i extending from each ofthe brake shoes 38.

Mounted within the casing 21, there is an electromagnet 42 equipped withan armature 43 connected with a lever dt which in turn is secured to theshaft 45 integral with the cam 40. When power is applied to theelectromagnet t2, which is the case whenever the lifting motor is shaft2|.

The.. construction of the brake drum 31 is' novel, its inner surfacehaving formed thereon fan blades 46 which draw air through louvres 41 inthe casing cover 28a. This air is forced over the solenoid 42,.the brakedrum 35, brake shoes 38, and the outside of the gear casing 28. The airblast leaves the hoist through opening 41a in the casing 21, as isapparent. Those skilled in the art will bestappreciate the merits ofthis l design. The brake drum, in addition to the blades 46, has aseries of reinforcing spoke-like portions 46a.

As shown in Fig. 2, rotation of the drum 25 winds hoisting cable 48which extends through a load sheave 49, and then is secured at 50 to thecentral supporting member ill. The controller casing 5| containssuitable electrically operated controlling mechanism actuated by pushbuttons 52 and E3 supported by a downwardly extending arm or cable 54. Alever 55 is pivoted at 56 to the -controller 5I and is adapted whencontacted by the sheave i9 upon the movement of the sheave to anelevated position, to shut oii' the power through operation of one ofthemeans in the controller casing, all as will be apparent to those skilledin the art.

I now claim:

1. In an electric hoist of the class described, a hoisting drum, asleeve supporting-said drum and to which said drum is fixed, a partitionon each side of said drum, a motor secured to one partition and havinga. drive shaft assembly passing through said partition, said sleeve andsaid second partition, bearing supports for said sleeve on each of saidpartitions, a gear housing and .a brake housing supported from saidsecond partition and separated from one another, said brake housinghaving a portion thereof vertically superimposed relatively to said gearhousing and complementary thereto whereby to form a cylindrical casingtherewith, spur gearing in said gear housing driven by a spur gear onsaid drive shaft also in said spur gearl housing, a gear on said drumsupporting sleeve positioned also in said gear housing and driven bysaid gearing whereby to rotate said drum, a brake drum on the end ofsaid drive shaft rotatable at the end of said brake housing, a brakingshaft mounted in that portion of said gear housing superimposed andcomplementary to said brake housing for rotation parallel to said driveshaft, a portion of said shaft extending into the end of the brakehousing adjacent said brake drum, Ia solenoid also in the saidsuperimposed portion of the gear housing for rotating said shaft, and a.brake band for said drum actuated by rotation of said shaft.

2. In 'an electric hoist of the class described, a hoisting drum, asleeve supporting said drum and to which said drum is fixed, a partitionon each side of said drum, a motor secured to one partition and having adrive shaft assembly passing through said partition, said sleeve andsaid second partition, said sleeve having bearing supports on each ofsaid partitions, a gear housing and a brake housing supported from saidsecond partition, spurl gearing in said gear housing driven by saiddrive shaft, a spur gear on said'drum supporting sleeve positioned insaid gear housing and driven by said gearing whereby to rotate saiddrum, a brake drum having a fan-like construction secured on the end ofsaid drive shaft assembly for rotation in said brake housing, and an endplate for said housing juxtaposed to said brake drum and having openingsthrough which air is forced into said brake housing by rotation of saidbrake drum.

3. In an electric holst of the class described, a hoisting drum, asleeve supporting said drum and to which said drum is xed, a partitionon each side of said drum, a motor secured to one partition and having adrive shaft assembly passing through said partition, said sleeve andsaid second partition, mid sleeve having bearing supports on each ofsaid partitions, a gear housing and a brake housing supported from saidsecond partion, spur gearing in said gear housing driven by said driveshaft, a spur gear on said drum supporting sleeve positioned in saidgear housing and driven by said gearing whereby to rotate said drum, abrake drum having a. fan-like construction secured on the end of saiddrive shaft assembly for rotation in said brake housing and an endplatefor said housing juxtaposed to said brake drum and having openingsthrough which air is forced into said brake housing by rotation of saidbrake drum, there being a further opening in said brake housing throughwhich said air is exhausted.

4. In an electric hoist of the class described, a hoisting drum, apartition on each side of said drum, a motor secured to one partitionand having a drive shaft assembly passing through said partitions, sai'ddrum having bearing supports on each of said partitions, a gear housingsupported from said second partition, a brake housing supported fromsaid gear housing and terminating in a circular end cover, gearing insaid gear housing driven by said drive shaft to rotate said drum, abrake drum having a fan-like construction secured on the end of saiddrive shaft assembly for rotation in said brake housing in juxtaposedrelation to said end cover, the said end cover for said brake housinghaving openings through which air is forced into said brake housing byrotation of said brake drum and a further opening through which said airescapes from said housing.

5. In an electric hoist of the class described, a motor, a motor drivenshaft, a hoist drum, gearing driven by said shaft to operate said hoistdrum, a brake drum secured. to one end of said shaft, brakes shoes forsaid brake drum, operating means for said brake shoes, a housing forsaid brake drum, said shoes andl operating means, a circular opening insaid brake drum, a series of fan blades protruding from said brake druminto said opening, a circular opening for said brake drum housingconcentric with said brake drum opening, a series of louvres for saidhousing opening, the rotation of said brake drum by said shaft pullingair into said brake drum housing through said housing opening, and afurther opening in said housing through which Said air is expelled fromsaid housing.

6. In an electric hoist of the class described, spaced first and secondmain plates, a sleeve supported on'said spaced main plates and extendingbeyond the first of said plates, a lgear casing plate secured to thesaid first plate and forming there- 2,244,221 -with a gear casing havingan upper relatively narrow chamber and a lower full chamber. a spur gearsecured about said sleeve and rotating partially in said narrow chamberand partially in said full chamber, a motor housing secured to thesecond of said main plates, a motor in said housing, a drive shaftextending from said motor and through said sleeve into said gear chamberand protruding beyond said gear chamber through said gear casing plate,a spur gear on said saft within said gear casing, gearing in the lowerm11 chamber of said gear casing adapted to be driven by said shaft spurgear and adapted to rotate said sleeve spur gear, a hoist drum Securedon said sleeve between said main plates, a

CHARLES S. SCHROEDER.

